Hi Wikidotians!
A question about the missing "gallery" command for "external" images let me think about a possibility to simulate such gallery with external images.
Because I need it for my genealogy-template I did it with dataforms on an autonumbering category "image-ext" on our Community Playground
such a "Gallery" page like http://community-playground.wikidot.com/image-ext:2 has this look: